EP 2316179 B1 20120222 - TIME SYNCHRONIZATION IN INDUSTRIAL PROCESS CONTROL OR AUTOMATION SYSTEMS
Title (en)
TIME SYNCHRONIZATION IN INDUSTRIAL PROCESS CONTROL OR AUTOMATION SYSTEMS
Title (de)
ZEITSYNCHRONISIERUNG IN INDUSTRIELLEN PROZESSSTEUERUNGS- ODER AUTOMATISIERUNGSSYSTEMEN
Title (fr)
SYNCHRONISATION TEMPORELLE DANS DES SYSTÈMES DE COMMANDE OU D'AUTOMATISATION DE PROCÉDÉ INDUSTRIEL
Publication
Application
Priority
- EP 2009060861 W 20090824
- EP 08163244 A 20080829
- EP 09809328 A 20090824
Abstract (en)
[origin: EP2159940A1] The present invention is concerned with improved time synchronization among the devices (10,20,30) of an industrial process control system, and in particular of a Substation Automation system, during a temporary absence of a system reference time. Hence, disruption of time-critical protection and control functions due to re-synchronization following the temporary absence of the system reference time is avoided, and the availability of the time-critical functions configured on the devices is increased. During normal operation, a device of the system records an offset or discrepancy between the system reference time and an internal local clock of the device for a period of several hours. As soon as the system reference time breaks down, the device starts predicting the offset or drift between its local clock and the unavailable system reference time based on the recorded offset history. As a transient clock master, the device then distributes an approximated or transient system reference time, based on the device's local clock corrected for the predicted offset, to other devices of the system that in turn run time-critical protection and control functions.
IPC 8 full level
H04J 3/06 (2006.01); G05B 19/042 (2006.01)
CPC (source: EP US)
G05B 19/0421 (2013.01 - EP US); H04J 3/0641 (2013.01 - EP US); G05B 2219/25049 (2013.01 - EP US); H04J 3/0644 (2013.01 - EP US); H04J 3/14 (2013.01 - EP US); Y02B 70/30 (2013.01 - US); Y04S 20/20 (2013.01 - US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
DOCDB simple family (publication)
EP 2159940 A1 20100303; AT E546901 T1 20120315; CN 102138292 A 20110727; EP 2316179 A1 20110504; EP 2316179 B1 20120222; ES 2383152 T3 20120618; US 2011135047 A1 20110609; WO 2010023175 A1 20100304
DOCDB simple family (application)
EP 08163244 A 20080829; AT 09809328 T 20090824; CN 200980134906 A 20090824; EP 09809328 A 20090824; EP 2009060861 W 20090824; ES 09809328 T 20090824; US 201113019703 A 20110202